#ifndef _CIRCLE_H
#define _CIRCLE_H


#include <iostream>

using namespace std;

const double PI = 3.1415926;

class Circle {
	double r;

public:
	Circle(double r);

	void set_r(double r);
	double get_r();

	double get_S();
	double get_C();
};

#endif // !_CIRCLE_H